The heaviest nucleus in which the fission barrier height has been measured
recently is \(^{254}\) No.
The value \(B_f\) =6.0 \(\pm \)  0.5 MeV at spin 15\(\hbar \) , giving by
extrapolation \(B_f\) =6.6 \(\pm \)  0.9 MeV at the spin 0\(\hbar \) , has been
deduced from the measured distribution of entry points in the excitation
energy vs. angular momentum plane [1]}. This result perfectly
agrees with our evaluation: \(B_f\) =6.88 MeV (at spin 0\(\hbar \)  ) and with the
MM model [2]} which gives: \(B_f\) =6.76 MeV.
The selfconsistent calculations, mainly based on the Skyrme interaction,
overestimate this barrier significantly [3]}, [4]}, [5]}
(9.6 and 8.6 or 12.5 MeV, respectively).
There are experimental estimates of barriers in a few SH nuclei,
based on observed ER production probabilities [6]}, which again
well agree with our barriers, see [7]}. Apart from those,
fission barriers in the SH region are generally unknown.
